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FBI's most famous mob cases

Roger "The Terrible" Touhy's GangTouhy and two of his partners were convicted in 1934 and sentenced to 99 years in prison for the kidnapping John "Jake the Barber" Factor and holding him for ransom.

The FBI has investigated them all… mafia gangsters, mob outlaws and more. Cycle through this slideshow to get a glimpse of some of the FBI's most famous and most significant cases over the past century.